Preheat your oven to 350°F (175°C) while you gather your ingredients.

Prepare your cupcake pan by lining it with paper liners.

Mix the dry ingredients in a large bowl: flour, sugar, cocoa powder, baking powder, and salt. Whisk until well combined.

Combine the wet ingredients: eggs, milk, vegetable oil in another bowl. Mix gently until blended.

Fold the wet mixture into the dry ingredients using a spatula until just combined.

Scoop the batter into your prepared cupcake liners, filling each about two-thirds full.

Bake in the preheated oven for 18-20 minutes or until a toothpick inserted comes out clean.

Let them cool completely on a wire rack.

In a bowl, beat together softened butter and powdered sugar until fluffy. Add cocoa powder and milk gradually until desired consistency.

Frost each cooled cupcake generously with your chocolate frosting using a piping bag or spatula.